Exhaust fan



A. F ROTH. EXHAUST FAN.

5. 1920. Patnted Mar. 14, 1922.

EETS-SHEET I.

Will

| a l/Ell A. F. ROTH.

EXHAUST FAN. APPLICATION nuzn APR, 15. 1920,.

2 SHEETS-SHEET 2.

Patented Mar. 14, 1922.

UNITED.- STATES PATIENT-OFFICE.

ADOIJPE I. ROTH, OI NEWARK, .TmtSE Y.

EXHAUST FAN.

To all whom it may concern Be it known that I, AnoLPH' F. ROTH, a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new .and useful Iin rovements in an Exhaust to provide a fan designed to be employed for ventilating compartments of houses, stores, factories, ships, underground chambers of mines and elsewhere so that foul atmosphere produced by being excessively charged with gas, acid fumes, heat, smoke and other foreign products maybe effectually exhausted, in order that the atmosphere may be kept free from injurious contamination. The invention consists mainly of the provision of a tube having an inlet and an outlet, and this tube is adapted to be supported so that its inlet leads from a,

com artment or air chamber which is susceptlble of being charged with impurities. At the outlet of the tube is provided an electrically operative motor having its drive shaft revolvable at the outlet, and on the motor shaft at the outlet of the tube is a suc-v tion-fan for being driven with the rotation of the shaft. Between the fan and the motor is a deflector for causing the air exhaust from the chamber through the tube to be discharged from the outlet in a manner to prevent the motor being contacted by the air exhaust which when charged with acid fumes or smoke or moisture or gas will tend to damage the motor. v

Another object of the invention is to inclose the motor in a cooling chamber or hood having spaced outlets so arranged that partial vacuums will be produced by the drivin of the fan and force of discharge of. the exhaust to cause the heat in the hood when generated by the operation of the motor to e suctionally discharged from the hood in order to prevent the'motor from becoming excessively heated.

A further object of, the invention is to provide in exhaust fan of a simple, eflicient and durable construction which may made of any. suitable material in various slzes and shgpes. y I 'ith these and other objects in view the invention will be hereinaftermore fully de- Speclflcation 01 Letters Patent. Patented Mar, 14, 1922 Application filed April is, 1920. serial'll'o. 374,1ao.

scribed with reference to the accompanying drawing forming a part of this specification in which similar characters of reference indicate corresponding parts in all the views, and will then be pointed out in the claims at the end of the description.

In the drawings, Figure 1 is afragmentary view, partly in section, showing an elevation of one form of exhaust fan embody ing my invention and the manner of its use for ventilating a compartment of a building or other structure.

F ig. 2 is an enlarged detail sectional view, partly broken away, taken through the fan, and

Fig. 3 is an enlarged plan, partly fragmentary, of the fan with its cooling hood removed therefrom.

The fan has a tube 10 which may be of anysuitable size and shape, though the tube illustrated is cylindrical and one end of the tube serves as an inlet 11, while its other end serves as an outlet 12. I When the fan is employed the inlet end of the tube is arranged in an opening, as 13, provided in an appropriate part of the wall or roof, as 14, 0f the compartment or chamber, as 15, of a house, store, factory, ship or mine which is to be ventilated, and the tube is preferably of a length so that its inlet end 11 extends interiorly of the compartment, while its outlet end terminates some distance beyondithe wall or roof. Exteriorly of the outlet end 12 of the tube may be an annular flange "16, and the tube may be securely supported on the wall or roof by'a number of spaced bars 17. "These bars are disposed in downward diver ing arrangement exteriorly of the tube,

and t e upper ends of the bars are fastened to the. flange 16' of the'tube, while their lower ends are fastened to the wall or electricity su ply. The motor is arranged so that its drive shaft20 is'disp'osed toward the center of the outlet 12 of the tube 10, and the motor is supported on the tube by a bracket, as 21, which preferably consists of a ringor band 22 arranged so that it fits closely around the casing of the motor. To

this band is connected the upper ends of a. number of spaced downwar y curved bars or legs 23 having their lower ends fixed to the flange 16 of the tube 10.

of the tube whereby a partial vacuum in the tube will be produced to cause the air with its impurities'to be freed from the chamber 15 by being suctionally forced through the a tube and discharged through the outlet of the tube. The blades of the fan are .mounted on a plate 26 which also serves as a deflector for preventing the air "products exhausted through the outlet 12 of the tube from contacting with the motor, in order,

' motor will be r v21 separate 0 that liability of premature damage to the revented especially. in instances where t eair is charged with acid fumes or smoke or gas or other foreign substances likely to affect the parts of the motor. The deflector or plate 26 is held on the drive shaft 20 of the motor so that it is spaced 'a distance from theend of the tube 10 providing the outlet 12, and this plate is preferably circular as. well as being of a dlameter approximately similar or slightly larger than the outlet of the tube. The-air-when discharged fromv the outlet of the tube by employing the deflector or plate in this manner will be forced from the lateral directions relative to the tube, and the motor will thereby be protected from subjection to the air products.

Serving to keep he motor cool during. its operation, I may provide a cooling chamber or hood, as 27. This cooling hood maybe of any appropriate form, thou h the hood shown is preferably compose of a body part, or cap .28 having a cone-shaped top 29 with an annular flange 3O-depend1ng from its edge of s de ending flange maybe an outwardly flare flange, as 31. 'The underside of the cap 28 is closed by ajplate, as 32, wh ch extends crosswise'interior y of the flared flange 31. The hood 27 is, arran ed so as to inclose the motor 18 by being 'sposed thereoven-with the legs 23 of the bracket 21 passing through spaced openings, not shown, in the plate 32; The plate-32 may be arranged on the legs of the bracket the cap 28, after which the cap and plate may soldered 'or otherwise Secured together. Leading from the interior 2 of the hood 27 are a number .of spaced out- 1' lets, as 33, which are in theforms'of tubular members each havin one of its ends disposed in an opening in the depending pleimpheral edge, and at the lower t l flange 3O ofthe cap 28 of the hood 27 These tubular members are also disposed on top of the flared flange 31- of the cap of the hood as well as being of lengths so that their second ends overhang the free edge of the flared flange. The flared flange 31 of the cap of the hood is of a diameter whereby the overhanging ends of the tubular outlets33 of the hood are disposed with relation to the tube 10 of the device so that the force of the exhausted air products discharged through the outlet 12 of the tube will when the fan is in operation produce by its suction partial vacuums in. the tubular outlets for causing the atmosphere in the hood when heated by the motor 18to be suctionally drawn therefrom through the outlets 33 of the hood.

In the foregoing description, I have embodied the preferred form of my invention, but I do not wish to be understood as limiting myself thereto, as I am, aware that modifications may be made therein without departing from the principle, or sacrificing any of the advantages of this invention,

I driven by a motor within the outlet of the outlet between the tube and the plate-ml. tube, and a hood having a closed underside supported in spaced relation to the outlet of the tube and inclosing the motor, sald hood having an inlet and. having spaced outlets arranged circumferentially of the outlet of the tube so that partial vacuums will 00 and discharge of the exhaust to cause the heat in the hood when generated by the operation of the motorto be suctionall dischar ed from the hood through its out ets.

a tube having an inlet and an outlet, ada to to be sup orted so that its inlet leads m an air -chamber, a suction fan rotatably driven b tube, a eflector between the fan and motor for causing the air exhaust from the chamberv a motor within the outlet of the our in theoutlets with the driving of the fan 2. n a ventilating device, in combinationi that partial vacuums will occur in the outlets with the driving 'of the fan and discharge of the exhaust to cause the heat in above and surrounding the outlet of the the cap when generated by the operation of the motor to be suctionally the hood through its outlets.

3. Ina ventilating device, in combination, a tube having an inlet and an outlet, adafpted to be supported so that its inlet leads rom an air. chamber, a suction fan rotatably' driven by a motor within the outlet of the tube, and a plate between the fanand motor for causing the air exhaust from the cham-. her through the tube to be discharged from the outlet of the tube whereby the motor will be protected against contact by the air exhaust. I

4. In an exhaust fan, the combination with the outlet of a chamber, of a hood supported in spaced relation to the outlet and having a closed underside, a motor in' the hood, a suction fan carried by the motor for being driven between the underside of the hood and the'outlet of the chamber, said hood having an inlet and having spaced outlets discharged from chamber so that partial vacuums will occur in the spaced outlets with the driving of the fan and discharge of the exhaust to cause the heat in the hood when generated by the operation of the motor to be suctionally discharged from the hood through its outlets.

5. In an exhaust fan, the combination with a .motor and a suction fan adapted to be supported above the outlet of a' chamber, of a hood surrounding the motor above the fan, and having a closed underside, said hood having an inlet and having spaced outlets arranged circumferentially above the outlet of the chamber so that partial vacuum will occur in the spaced outlets with the driving of the fan and discharge of the exhaust to- ADOLPH RVOTH."

Witnesses M. SANDERSON J. Fnmmmox nmm 

